LCD Image Processing for Chromatic Visible Angle Compensation
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Solution Overview
Problem
Large LCDs experience significant color shift and wash-out when viewed from off-axis angles due to birefringence effects, leading to reduced transmittance and a grid formation between main and sub pixel blocks when trying to improve chromatic visible angles.
Innovation Solution
An image processing method that divides pixels into main and sub pixel blocks, adjusts white dot coordinates using gamma modules, and selects between high-voltage and low-voltage grayscale lookup tables based on block arrangements to calculate and optimize chromatic visible angles through color saturation adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pixels are divided into main pixel blocks and sub pixel blocks to improve chromatic visible angle, then viewing angle performance is improved, but a grid is easily formed between blocks and transmittance is reduced
Solution Approach 1:
The patent divides pixels into main pixel blocks and sub pixel blocks with different voltage characteristics to improve chromatic visible angle. Each block type receives different voltage levels (main blocks receive higher voltage, sub blocks receive lower voltage) to compensate for viewing angle color shifts, thereby resolving the contradiction between improving viewing angle adaptability and avoiding grid formation artifacts.
2Adaptability or versatility
If pixels are divided into main pixel blocks and sub pixel blocks to improve chromatic visible angle, then viewing angle performance is improved, but transmittance is reduced
Solution Approach 1:
The patent applies different voltage levels to different pixel block types (main blocks vs. sub blocks) based on their specific positions and functions. Main pixel blocks receive higher voltage to maintain color accuracy at wide viewing angles, while sub pixel blocks receive lower voltage to preserve transmittance efficiency, thereby resolving the contradiction between improving chromatic visible angle and maintaining transmittance.
3Measurement precision
If a viewing-angle compensation algorithm is used to compensate for a particular viewing angle, then color accuracy is improved for that angle, but other viewing angles become relatively inaccurate
Solution Approach 1:
The patent creates a universal compensation system that simultaneously handles multiple viewing angles through the combined operation of main pixel blocks and sub pixel blocks. By having both block types work together with different voltage characteristics, the system achieves color accuracy across a wide range of viewing angles rather than optimizing for just one specific angle, thereby resolving the contradiction between precision at a particular angle and adaptability across multiple angles.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method effectively compensates for multiple viewing angles, preventing color shift and grid formation, and maintains optimal chromatic visible angles regardless of display size, ensuring accurate color representation across various viewing positions.
Implementation Method 1
a viewing angle feature of the displays becomes an important indicator for color quality of the displays. Generally speaking, a viewing angle color difference of a Vertical Alignment (VA) LCD is greater than an In-Plane Switching (IPS) LCD because different of birefringence effects of liquid crystals.
Data Source
AI summary
This application relates to an image processing method of a display device, The method includes: dividing a picture of a display device into several main pixel blocks and several sub pixel blocks; adjusting white dot coordinates by using a gamma module; obtaining a high-voltage grayscale lookup table by using a high-voltage gamma module and obtaining a low-voltage grayscale lookup table by using a low-voltage gamma module; selecting to output the high-voltage grayscale lookup table or the low-voltage grayscale lookup table by using a first selection module; calculating a color saturation of the picture of the display device by using a color saturation calculation module; and adjusting, by a second selection module, a chromatic visible angle value in the display device according to the color saturation and the white dot coordinates, the high-voltage grayscale lookup table or the low-voltage grayscale lookup table.